mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 20:22:09 +00:00
0dd061a6a1
Add a hook named update_socket_protocol in __sys_socket(), for bpf progs to attach to and update socket protocol. One user case is to force legacy TCP apps to create and use MPTCP sockets instead of TCP ones. Define a fmod_ret set named bpf_mptcp_fmodret_ids, add the hook update_socket_protocol into this set, and register it in bpf_mptcp_kfunc_init(). Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/79 Acked-by: Matthieu Baerts <matthieu.baerts@tessares.net> Acked-by: Yonghong Song <yonghong.song@linux.dev> Signed-off-by: Geliang Tang <geliang.tang@suse.com> Link: https://lore.kernel.org/r/ac84be00f97072a46f8a72b4e2be46cbb7fa5053.1692147782.git.geliang.tang@suse.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
37 lines
872 B
C
37 lines
872 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Multipath TCP
|
|
*
|
|
* Copyright (c) 2020, Tessares SA.
|
|
* Copyright (c) 2022, SUSE.
|
|
*
|
|
* Author: Nicolas Rybowski <nicolas.rybowski@tessares.net>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "MPTCP: " fmt
|
|
|
|
#include <linux/bpf.h>
|
|
#include "protocol.h"
|
|
|
|
struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk)
|
|
{
|
|
if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && sk_is_mptcp(sk))
|
|
return mptcp_sk(mptcp_subflow_ctx(sk)->conn);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
BTF_SET8_START(bpf_mptcp_fmodret_ids)
|
|
BTF_ID_FLAGS(func, update_socket_protocol)
|
|
BTF_SET8_END(bpf_mptcp_fmodret_ids)
|
|
|
|
static const struct btf_kfunc_id_set bpf_mptcp_fmodret_set = {
|
|
.owner = THIS_MODULE,
|
|
.set = &bpf_mptcp_fmodret_ids,
|
|
};
|
|
|
|
static int __init bpf_mptcp_kfunc_init(void)
|
|
{
|
|
return register_btf_fmodret_id_set(&bpf_mptcp_fmodret_set);
|
|
}
|
|
late_initcall(bpf_mptcp_kfunc_init);
|